78442872 has 16 divisors (see below), whose sum is σ = 196107240. Its totient is φ = 26147616.

The previous prime is 78442823. The next prime is 78442891. The reversal of 78442872 is 27824487.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1634203 + ... + 1634250.

Almost surely, 2^78442872 is an apocalyptic number.

It is an amenable number.

78442872 is an abundant number, since it is smaller than the sum of its proper divisors (117664368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78442872 is a wasteful number, since it uses less digits than its factorization.

78442872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3268462 (or 3268458 counting only the distinct ones).

The product of its digits is 200704, while the sum is 42.

The square root of 78442872 is about 8856.7980670217. The cubic root of 78442872 is about 428.0729924713.

The spelling of 78442872 in words is "seventy-eight million, four hundred forty-two thousand, eight hundred seventy-two".